how to render datetime in a particular format in extjs

I have a grid in there is field updatedon which is datetime coming from db e.g. 2011-03-22 01:45:00

here is my reader code :

{name: 'updatedon', type:'datetime'},

here is my renderer code :

{
    id       :'updatedon',
    header   : ' updatedon', 
    width    : 100, 
    sortable : true, 
    dataIndex: 'updatedon',
    renderer: Ext.util.Format.dateRenderer('d/m/Y')
},

ho开发者_JAVA百科w should i render to get 22/03/2011

done by changing the reader code

{name: 'updatedon' ,type:'date' ,dateFormat: 'Y-m-d H:i:s'},